Adds a ITrackerStateListener to the TET C# client. This listener
will recieve updates about change of active screen index.
Namespace: TETCSharpClientAssembly: TETCSharpClient (in TETCSharpClient.dll) Version: 1.0.0.0 (1.0.0.0)

Parameters
- listener
- Type: TETCSharpClient ITrackerStateListener
The ITrackerStateListener instance to add
